Fluidyne marine pendulum inclinometer or pendulum clinometers are instruments used for positioning ships or submarines on proper trim. The correct heel angle can be determined for appropriate location of cargo and equipment. Fluidyne inclinometers are required to be installed one each in Beam Axis and Keel Axis to determine the accurate adjustments of the trim angle of the ship or submarine. Illumination can also be provided for the scale and pendulum.